GRADE 8 SCIENCE REVIEWER (1ST QUARTER)
■
■ 1. CELLS AND THEIR FUNCTIONS
■ Key Concepts
• A cell is the smallest unit of life.
• All living organisms are made of one or more cells.
■ Types of Cells
• Plant Cells
■ Have cell wall (gives structure)
■ Have chloroplast (for photosynthesis)
• Animal Cells
■ No cell wall or chloroplast
■■ Parts of the Cell
• Nucleus – control center of the cell (contains DNA)
• Cell Membrane – controls what enters and leaves the cell
• Mitochondria – produces energy (“powerhouse”)
• Cytoplasm – jelly-like substance where organelles are found
■ Important Idea
Cells → Tissues → Organs → Organ Systems → Organism
■
■■ 2. MATTER AND ITS PROPERTIES
■ What is Matter?
• Anything that has mass and occupies space
■■ States of Matter
• Solid – fixed shape and volume
• Liquid – fixed volume, takes shape of container
• Gas – no fixed shape or volume
■ Changes in Matter
• Physical Change
■ No new substance formed
■
■ 1. CELLS AND THEIR FUNCTIONS
■ Key Concepts
• A cell is the smallest unit of life.
• All living organisms are made of one or more cells.
■ Types of Cells
• Plant Cells
■ Have cell wall (gives structure)
■ Have chloroplast (for photosynthesis)
• Animal Cells
■ No cell wall or chloroplast
■■ Parts of the Cell
• Nucleus – control center of the cell (contains DNA)
• Cell Membrane – controls what enters and leaves the cell
• Mitochondria – produces energy (“powerhouse”)
• Cytoplasm – jelly-like substance where organelles are found
■ Important Idea
Cells → Tissues → Organs → Organ Systems → Organism
■
■■ 2. MATTER AND ITS PROPERTIES
■ What is Matter?
• Anything that has mass and occupies space
■■ States of Matter
• Solid – fixed shape and volume
• Liquid – fixed volume, takes shape of container
• Gas – no fixed shape or volume
■ Changes in Matter
• Physical Change
■ No new substance formed
